EP (endpoint device) works. In EP mode, PCIE type 0 is used to configure the header.
PCIE Learning Terminology (continuously updated)
RC: root complex, RC device is used to connect CPU/ memory subsystem and I/O device; In RC mode, the type value in the PCIE configuration header is1; RC mode supports configuration and I/O transactions.
EP: Endpoint, and EP devices usually represent serial or I/O devices; In EP mode, the type value in the PCIE configuration header is 0; In EP mode, PCIE controller receives read and write operations of local memory space.
RCW: Reset Configuration Word
POR: power-on reset
MSI: message signal interrupt
FC: flow control
Sticky register: Keep this bit at 0, and this bit will be set only when the state occurs to prevent it from being set by software error.
ARI: alternative route identification
LUT: lookup table
AER: advanced error reporting
TLP: transport layer packet
DLLP: Data Link Layer Packet
At present, PCI interface graphics cards are rare, only available on older PCs, and manufacturers rarely introduce such interface products. Of course, many servers don't need good performance of graphics cards, so they use old PCI graphics cards. Usually, only some motherboards (such as AGP or PCI Express) without special slots for graphics cards will consider using PCI graphics cards, such as upgrading 845GL motherboards. The performance of PCI graphics card is greatly limited, and the price is not cheap because it is scarce, so only consider PCI graphics card when it is absolutely necessary.
Interfaces of PCI-E vary according to the bus bit width, including X 1, X4, X8 and X 16. The internal interface will use X2 mode instead of slot mode.
PCI-E specification is connected from 1 channel to 32 channels, which is very extensible and can meet the different requirements of different system devices for data transmission bandwidth. In addition, the shorter PCI-E card can be inserted into the longer PCI-E slot, and the PCI-E interface can also support hot plug, which is also a big leap.
The 250MB/ s transmission speed of PCI-EX 1 can meet the data transmission bandwidth requirements of mainstream audio chips, network card chips and storage devices, but it is far from meeting the data transmission bandwidth requirements of graphics chips.